Question about 2002 Pontiac Grand Am

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My 2002 Pontiac Grand Am with 6cyclinders is running hot and the coolant tank is being replaced as well as a water pump. What else could be making the engine run hot if I only replace the water pump and coolant tank.

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  • yolove913 Nov 10, 2010

    Ok, the mechanic is stating that when he put the water pump on and let the car run for 2-3mins the engine started running hot. I had to replace the coolant tank and he was supposed to put a water pump on it. Now he is telling me that the head gasket is busted and I need to replace that, however, I'm not understanding why the engine didn't warn of a head gasket before he had to replace the water pump. I was also told to have him check my fans as they were not working at the time.

  • yolove913 Nov 11, 2010

    Thank you so much for your advise. I feel a lot better now knowing that he is not ripping me off. Kudos to you for such quick response and great knowledge.

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  • Master
  • 1,168 Answers

Hello Yolove.


There are a few items that will make your Pontiac run hot.

A plugged radiator, a thermostat sticking closed, something in front of the car reducing airflow through the radiator, pinched coolant hoses, low coolant levels, gaskets leaking internally and radiator cooling fans not working.
Water pumps rarely cause overheating unless they are leaking out coolant or the belt isn't turning the pulley.

There are the the answers to your question. I hope you find the source of your problem easily and inexpensively.

Thank you for using FixYa.

KL

Posted on Nov 11, 2010

  • FUBAR Nov 11, 2010

    I am curious about the coolant tank and why it needs to be replaced.
    If the tank ruptured it would certainly be an indication of a bad head gasket.
    If exhaust gases were entering the cooling system it would expand the tank faster than the rad cap would allow the pressure to release and blow it open.

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  • Pontiac Master
  • 22,095 Answers

Water pump is most obvious as the impeller is plastic on a metal drive shaft and they do often come loose ,a sticking thermostat would cause the problem as would a blocked radiator ,if its radiator just put the internal heater on full and see if runs cool with heater on ,could be cooling fan not cutting in when engine hot ,but if your driving along and its running hot then something is wrong as the engine doesnt need the fan on when in motion as the air flow will keep it cool ,its more for stop start driving .So if its running hot whilst driving along with no stopping it could be the radiator blocked or the cooling tubes filled with mud so hose down of the outside of the rad .A head gasket would cause the system to pressurise and lose water this would be visable by starting the engine with rad cap off and seeing if it starts to push the water up .

Posted on Nov 10, 2010

  • Colin Stickland
    Colin Stickland Nov 11, 2010

    your mechanic is totally right in his diagnostics ,because i have changed the head gasket in the past when it was this plastic impeller causing the problem so at least he got it the right way round and checked the pump first

  • Colin Stickland
    Colin Stickland Nov 11, 2010

    in fact treat him to a cup of coffee and charge it to me

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